A submarine is 46 m below sea level, and it descends 24 m. How far below sea level is it? a. The submarine is 70 m below sea level. b. The submarine is 46 m below sea level. c. The submarine is 24 m below sea level. d. The submarine is 94 m below sea level.

Answers

Answer 1

Answer:

Answer:70 m below

Explanation:

46 +24= 70

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An object of the same mass has three different weights at different times. Which statement is possible?

Answers

So we want to know how can an object have three different weights at different times. So weight is Fg=m*g, where m is the mass of the objecct and g is the gravitational acceleration. On Earth, g=9.81 m/s^2, in space g is much less and on the moon g=1.625 m/s^2 So we see that the object changes its weight by moving it to space and on the Moon.

The object started on earth, was transported to space,and was deposited on the moon

What objects can be seen from earth because they producde there own light? 

Answers

- neon signs
- fireworks
- rockets during the ascent
- meteors
- fireflies
- stars

What do we call the minimum energy that is required by an electron to leave the metal target in the photoelectric effect?Select one of the options below as your answer: A. energy function B. minimum function C. work function D. quanta E. electrical energy

Answers

Answer:

C. work function

Explanation:

In the photoelectric effect, the energy of the incident photon is used in part to extract the electron from the metal (and this energy is called work function) and the rest is converted into kinetic energy of the electron. In formula:

$hf = \phi +K$

where

hf is the energy of the incident photon, which is the product between h (the Planck constant) and f (the photon's frequency)

$\phi$ is the work function

K is the kinetic energy of the photoelectron as it leaves the material

The work function is what we call the minimum energy that is required by an electron to leave the metal target in the photoelectric effect.

A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?

Answers

"10" is not a very satisfying description of an angle.
I'll assume it's 10 degrees, and that it's the angle of the initial trajectory
above the horizontal.

The vertical component of the ball's speed is 30 sin(10°) = 5.209 meters per second.

The acceleration of gravity is 9.8 meters per second² downward.

The ball continues to rise for 9.8/5.209 = 1.881 seconds after the kick.
At that time, it reaches the peak of its arc, and if nobody else has contacted it yet,
it begins to fall, and takes the same length of time to return to the ground whence
it was kicked.

So the time between the kick and return to the ground is (2 x 1.881) = 3.763 seconds.

Note: As is customary and necessary at the high school level,
we assume no air resistance.

A ball is dropped from a height of 16 feet. Each time it drops h feet, it rebounds 0.81h feet. Find the total distance traveled by the ball.

Answers

The first drop makes the ball travel 16 m.
Then the maximum height decreases to 16 x 0.81
And the distance traveled is twice the distance traveled.
If we make a pattern, this forms a geometric progression in which the common ratio is 0.81 and the first term is 16.
The sum of this series: a / (1 - r)
= 16 ( 1 - 0.81)
= 84 feet
This is the upward height, and the ball returns every time so:
Total distance = 84 x 2
= 168 feet

An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?

Answers

The sprinter accelerates at 1.1 meter per second.

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